COMBIN

Returns the number of combinations[1][2] of n unlike things taken k at a time.

Syntax:

COMBIN( n:Number, k:Number )

This function yields the number of combinations of n unlike things taken k at a time.

Formula:

nCk = n!  ∕  ((nk)! × k!)

For very large n an approximation is achieved using logarithms.

Revisions:

This function was added in 1.30.

  1. Weisstein, Eric W. "Combination." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Combination.html
  2. "Permutations and Combinations." Chapter V, Section E, Online Statistics Education: A Multimedia Course of Study (http://onlinestatbook.com/). Project Leader: David M. Lane, Rice University.